Improvement in grinding dies for nail-machines



UNITED STATES PATENT OFFICE.

GEORGE B. WIGGIN AND J. W. HOABD, OF PROVIDENCE'BHODE ISLAND.

IMPROVEMENT IN GRINDING DIES FOR. NAIL-MACHINES.

Specification forming part of Letters Patent N0. 37,657, dated February 10, 1863.

To all whom it may concern..-

Beit known that we, GEO. B. WIGGIN and J. W. HOARD, both of the city and county of Providence, in the State of Rhode Island, have invented a new and useful improvement in machines for grinding the dies used for grasping the nail in a nail-machine while it is being headed 5 and we do hereby declare that the following specilication, taken in connection with the drawings making a part of the same, is a full, clear, and eXactdescription thereof.

Figure 1 isfront view. Fig. 2 shows the position ofthe dies with reference to each other when adjusted in the nail-machine.

Figs 3 and 4t are fragments ot' the grinding-5 wheels.

In the accompanying drawings, a a, Fig. 1, represent a pair ot'dies used in a nail-machine. These dies are placed in the machine at the same angle as shown in the grinding-machine, and are also placed on an angle of inclination as respects each other as shown in Fig. 2. The face oteach die has a groove or score in it, as shown at b, Fig. 1, for the purpose of receiving the nail. After the nail has been eut from the plate, it is gripped between dies of the character shown, placed opposite to each other, and held between them while itis headed. It is material that the faces as well as the groove should be truly and accurately ground, and that the dies should stand at an angle with reference to each other, as otherwise the grip ofthe dies would indent the nail-blank, which is wider at the head end than at the point, and injure the appearance of the nail.

In order to eii'ect the result which we have :in view, we arrange two upright grindingwheels, A, and B, in a frame, with suitable bearings, and communicate motion to each of them by means of `a driving-belt running around pulleys on the shaft of the wheels, one of which is shown at C. The wheel A has a broad face for grinding the faces of the dies, while the wheel B has a bead around its pethem.

riphery in form the reverse ofthe score to be cut. In front ofthe shafts ofthe wheels and parallel to a line drawn through their centers is placed a pair of guides, one of which is shown at D. The carriage E is fitted to slide upon these guides and to be controlled by The carriage itself is made'in two parts, the upper portion being fitted to slide upon the lower portion by means ot' a dovetailed slide and tongue, c and d, so that the upper portion ofthe carriage can be moved toward or away from the grinding-wheels, and is controlled in this movement by means of a feedscrew, the handle of which is seen at e, and which runs through the dovetail c, and works into a nut fixed in the upper portion ofthe carriage. The dies are placed, as shown, upon the platform of the carriage, which is inclined upon the same angle as that at which the dies will stand when fixed in the nail-machine, and are secured thereto by a clamp, f.

It is obvious than when motion has been communicated to the grinding wheels that it' the carriage E is moved from right to left the faces ofthe dies will be brought in contact with the grinding-faces of each wheel in succession, and thus the score or groove b, as well as the faces of the dies, will be accurately ground.

In order that the position oi' the score may be changed it' desired, a means of adjusting the wheel B is shown in Fig. 1., consisting ot' a screw, g, placed at the foot of the shaft, by means ot' which the height ot' the wheel may be adjusted at pleasure.

What we claim as our invention, and desire to secure by Letters Patent, is-

The combination and arrangement of the two grindingwheels A and B with the movable carriage E, substantially as described, for the purposes specified.

GEO. B. WIGGIN. Witnesses: J. W. BOARD.

BENJ. F. THURs'roN, JOHN D. THUEs'roN. 

